The results showed that 13 types of cells, including B cells, Plasma cells, CD4+ T cells, CD8+ T cells, classical dendritic cells cDCs), plasmacytoid dendritic cells pDCs), endothelial cells, epithelial cells, fibrocyte, macrophage, mast cells, monocyte, NK cells, could be detected in all the multi-cancer species evaluated Figure 2A, 2B). The gene discussed is CD4; the disease is cancer.